10.3.4.1. Outlet air aperture required for natural ventilation


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Fig. 10.6: Natural ventilation of a compressor installation room
with a sound-insulated BOGE screw-type compressor
An adequate flow of cooling-air C can only be obtained with natural ventilation if the air inlet and outlet apertures are of an appropriate size.

The figures in the following table are based on VDMA specification sheet 4363 „Ventilation of installation rooms for air-cooled compressors“.
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In principle, the air inlet A in and outlet apertures A out should be of equal size. The cooling air has to pass through both apertures. But taking into account the installation of roller shutters, grids and the like, the air inlet aperture should be approx. 20 % larger than the air outlet aperture A out . If this is not the case, the maximum admissible ambient temperature may be exceeded.

Note

When defining the flow of cooling-air C for a compressor station, the cooling-air requirement of a cold compressed air dryer or heat-generating absorption dryer must be included in the calculations.
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